Tie for concrete forms



Aug. 2, 1966 M. J. cox ETAL TIE FOR CONCRETE FORMS 2 Sheets-Sheet 1 Filed Sept. 18, 1964 INVENTORS Man/e05 d COX, C'l/flELES 6 5757 47706/VEY62 g- 2, 6 M. J. cox ETAL 3,263,958

TIE FOR CONCRETE FORMS Filed Sept. 18, 1964 2 Sheets-Sheet 2 FIG. 4.

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United States Patent 3,263,958 TIE FOR CONCRETE FORMS Monroe J. Cox, Louisville, Ky. (201 Meridan Road, St.

Matthews, Ky.), and Charles G. Steier, 3800 Youngwood Road, Louisville 18, Ky.

Filed Sept. 18, 1964, Ser. No. 397,466 1 Claim. (Cl. 249213) This invention relates to a tie for concrete forms, and more particularly to a boring bit type of tie assembly.

The primary object of the invention is the provision of an assembly of this kind which is adapted to be quickly, easily, and accurately drilled, by means of an electric drill, through the panels of concrete forms, of different widths, whereby very substantial savings in time and in labor are achieved over present methods.

Another object of the invention is the provision of an assembly of the character indicated above, comprising a tie rod, having on one end a boring bit, and, on its other end, a drill chuck engaging member, the rod being formed, at intervals with opposed break-off notches, the boring bit end of the tie being formed, at its ends, with means facilitating withdrawal of the tie rod, from a concrete form, by means of a suitable tool.

A further object of the invention is the provision of an assembly of the character indicated above, which further comprises key-plates, adapted to engage parts of a concrete form, and having keyhole openings through which the drill chuck end and the boring bit end of the tie rod are adapted to engage, the tie rod being larger in diameter than the slots of the keyhole openings of the plates and smaller in diameter than the round holes of these openings, the rod being formed adjacent its ends, with opposed squared notches adapted to lockingly wedge in the slots of the key-plates.

In the drawings:

FIGURE 1 is a fragmentary perspective view of a filled concrete form, parts being broken away and in section, showing an assembly of the present invention installed;

FIGURE 2 is an enlarged vertical transverse section taken on the line 2-2 of FIGURE 1;

FIGURE 3 is an enlarged fragmentary vertical longitudinal section taken on the line 3--3 of FIGURE 2;

FIGURE 4 is a vertical transverse section taken on the line 44 of FIGURE 3;

FIGURE 5 is a side elevation of the rod;

FIGURE 6 is a fragmentary perspective view, on a reduced scale, showing the tie rod about to be engaged in the chuck of an electric drill;

FIGURE 7 is an enlarged fragmentary perspective view of the boring bit end of the tie rod;

FIGURE 8 is a side elevation, partly broken away and in section, showing the chuck end of the tie rod engaged in a special electric drill chuck; and

FIGURE 9 is a transverse section taken on the line 99 of FIGURE 8.

Referring in detail to the drawings, a concrete form F is shown, which comprises a pair of perpendicular laterally spaced panels 10,of such as plywood, against the outer sides of which longitudinal spaced perpendicular studs 12 bear. Vertically and closely and parallel spaced pairs of wales 14 bear against the outer edges of the studs 12, below the upper ends of the studs. A poured filling of concrete C is between the panels 10.

An assembly of the invention, generally designated 16, comprises a pair of similar key-plates 18, adapted to bear against and span the wales 14, at selected intervals therealong. The key-plates 18 are of vertically elongated rectangular shape and are at least as tall as the combined thicknesses and the spaces between the wales 14. The

key-plates are centrally formed with vertically elongated keyhole openings 20, comprising vertical slots 22 narrower than a tie rod, which open diametrically to the undersides of relatively large diameter round holes 24.

The assembly 16 further comprises, for each pair of key-plates 18, a single straight tie rod 26, which is longer than the thickness of the concrete form F. The rod 26 has a main central portion 28, which is smooth, except for two or more weakened areas, defined by opposed V-shaped notches 30.

The main portion 28 of the tie rod merges into a chuck end portion 32, which is formed, adjacent to the tie rod end 34, with a pair of diametrically opposed fiat rectangular wings 36. The wings 36, as shown in FIG- URES 6, 8 and 9, are adapted to be non-rotatably secured in a longitudinal slot 38, formed in the head 40 of a drill chuck 42, having a shank 44 adapted to be secured in the chuck 46 of an electric drill 48. This special chuck arrangement, in conjunction with the Wings 36, enables merely pulling the drill off the tie rod, when the drilling has been completed, instead of taking the time to release the tie rod from a conventional drill chuck.

Near to but spaced inwardly from the wings 36, the tie rod is formed with a row of equally longitudinally spaced, opposed squared notches 50, which are adapted to accommodate a suitable tool (not shown) for withdrawing the tie rod 26, from the concrete form F.

The tie rod 26 terminates, at its other end, in a doubleway boring bit 52, which is larger in diameter than the tie rod. A row of tool accommodating square notches 54, similar to the notches 50, is formed in the rod adjacent to and inwardly of the bit 52.

In use and operation, a key-plate 18, which is formed with nail holes 56, above and below the key-hole openings 20, is nailed, as indicated at 58, through the holes 56, to the outer edges of the wales 14, at the approach side of the form F. As shown in FIGURES 3 and 4, the outer sides of the key-plates 18 are cut away to define upwardly and inwardly angled wedges 60, along the sides of the slots 22 of the keyhole openings 20, so that, when a pair of squared notches 50 or 54 are pressed downwardly from the holes 24 of the keyhole openings 20, into the slots 22, the related ends of the tie rod are wedgingly locked to the key-plate 18.

The bit end of the tie rod 26 is then passed through the circular hole 24 of the key-plate 18, at the approach side of the concrete form F, until the bit end engages the adjacent form panel 10. The chuck end of the tie rod 26 is then engaged in the special drill chuck 42 and drilling begun by actuating the electric drill 48 and eX- erting forward pressure.

When the drill bit 52 shows through the remote form panel 10, the other key-plate 18 is installed, like the firstmentioned key-plate, on the wales 14, with its keyhole opening 20 lined up with the bit end of the tie rod. As the bit end of the tie rod clears the second form panel 10, and enters the hole 24 of the key-plate, further pull on the tie rod can be applied, by means of a suitable tool (not shown) applied to the adjacent squared notches 54, so as to properly position the tie rod 26 relative to the form F. Related squared notches 50, 54, at both ends of the tie rod, are then depressed into the keyhole slots 22, so as to wedgingly lock the tie rod in place, relative to the form F.

If desired, the tie rod 26 may be left, in entirety, in place of the form F, or it may be entirely withdrawn therefrom, through the holes 24 of the key-plates 18; or only the middle portion of the tie rod, can be left in place in the concrete. The last situation is accomplished by exerting pull on one end of the tie rod 26, by means already indicated, while the other end of the tie rod is locked, by means of a squared notch 50, 54 being en- -26 can be installed substantially more easily and quickly than presently available tie rods, and that tie rods 26 can be removed with similar ease and dispatch.

What is claimed is:

A concrete form tie comprising a round rod having a substantially straight middle portion of uniform crosssection, one end portion of said rod being formed with engager means adapted for operative engagement with the chuck of an electric drill, the other end of said rod termimating in a drill bit larger in diameter than said middle portion, said engager means comprising a pair of diametrically-opposed wings and a chuck having a shank adapted to be engageable in the chuck of an electric drill, said rod'being formed adjacent to said engager and adjacent to the boring drill bit with rows of spaced pairs of opposed squared notches adapted to be lockingly engaged with retaining means on opposite sides of a concrete form.

References Cited by the Examiner UNITED STATES PATENTS 1,108,888 9/1914 Cousins 249 40 1,712,876 5/1929 Dolezal 14S1 16 2,358,077 9/1944 Koctt 1 16 2,778,087 1/1957 Krueper 249-213 3,057,034 10/1962 Helmick 249-213 J. SPENCER OVERHOLSER, Primary Examiner.

G. A. KAP, Assistant Examiner. 

